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Science Y8 > Sound > Flashcards

Sound Flashcards

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1
Q

Light and water waves are what type of waves

A

Transverse

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2
Q

Sound is what type of wave?

A

Longitudinal

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3
Q

True or False, sound waves have vibrations that are parallel to the direction of the wave?

A

True - Longitudinal wave vibrations are parallel to the direction of the wave.

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4
Q

Are the vibrations in Longitudinal waves parallel to the direction of energy transfer?

A

Yes

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5
Q

Fill in the missing word:

Sound travels as a Longitudinal P_______ Wave

A

Sound travels as a Longitudinal Pressure Wave.

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6
Q

Why does sound require a medium to travel through?

A

Something has to pass on the sound vibration.

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7
Q

Why can’t sound travel in space?

A

Space is mostly a vacuum, which means there are no particles to pass on the vibrations.

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8
Q

Vibrations are passed through mediums as a series of what?

A

Compressions.

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9
Q

What are compressions in sound waves?

A

regions of squashed up particles.

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10
Q

Can sound be reflected and refracted like light?

A

Yes

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11
Q

Give an example of a sound reflection.

A

Echo

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12
Q

Give an example of objects around the home that absorb sound easily.

A

Soft furnishings - Carpets, curtains.

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13
Q

Does the medium that sound is passing through affect the speed at which it travels?

A

Yes

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14
Q

Fill in the missing words:

The ____ particles there are, the faster a sound wave ______.

A

The MORE particles there are, the faster a sound wave TRAVELS.

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15
Q

Does sound usually travel faster in solid or gases?

A

Solids

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16
Q

Does sound usually travel faster in more or less dense mediums?

A

More

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17
Q

Does sound or light travel faster?

A

Light

18
Q

Does sound travel faster in Wood or Water?

A

Wood.

19
Q

The frequency of sound can be described as the number of complete _______ that pass a point per second.

A

waves

20
Q

Does high or low frequency mean more vibrations per second?

A

High

21
Q

What is frequency measure in?

A

Hertz (Hz)

22
Q

Hertz (Hz) is the number of what per second?

A

vibrations.

23
Q

Put the following stages of hearing sound in the right order:
A)Ear Bones vibrate
B) Object vibrates
C) Ear drum vibrates
D) Hairs vibrate in the cochlea, sending a mesage to the brain along the auditory nerve.
E) Air Vibrates

A

B, E, C, A, D

24
Q

What is described here:

The range of frequencies that you can hear.

A

Auditory range.

25
Q

What is the typical auditory range of humans?

A

20 - 20,000 Hz

26
Q

Can humans typically hear high pitched sounds above 20,000 Hz?

A

No

27
Q

Do all humans have the same auditory range?

A

No

28
Q

Can animals like dogs and bats usually hear higher frequency sounds than humans?

A

Yes

29
Q

Can dolphins usually hear lower pitch sounds than humans?

A

No

30
Q

Is the pitch of sound different to the frequency?

A

They are related, but pitch is a perceptual quality, while frequency is the scientific measurable attribute of the sound.

31
Q

How do sound waves transfer energy and information from one place to another?

A

by vibrations between particles - pressure changes.

32
Q

What is the name of the thin membrane of material within a microphone that receives the sound wave vibrations?

A

A diaphragm

33
Q

What does a microphone convert sound wave vibrations to?

A

Electric signals

34
Q

What does the the recording of electric signals from a microphone allow us to do?

A

reproduce the sound later.

35
Q

What do loudspeakers do?

A

Recreate sound waves from electrical signals

36
Q

What does a loudspeaker use to vibrate the air and reproduce sound waves?

A

a diaphragm

37
Q

What is ultrasound?

A

High frequency sound that we can’t hear - higher frequency than the normal auditory range of humans - Sound over 20,000Hz

38
Q

What is ultrasound cleaning?

A

the frequent vibrations of the pressure waves dislodge dirt in difficult to clean cracks.

39
Q

Give an example of items that are sometimes cleaned using ultrasonic cleaning.

A

Jewellery, teeth, fountain pen nibs

40
Q

What is Ultrasound physiotherapy?

A

Ultrasound pressure waves transfer energy through matter, and can reach inside the body.

41
Q

Some physiotherapists believe that ultrasound therapy can treat difficult to reach muscles and tendons inside the body, do scientists agree?

A

No, scientists have found little evidence that this is an effective treatment.

Science Y8 (15 decks)

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